I think this GM-less is played online with a browser.
You are an assistant curator of the natural history museum in the city where you live. It’s a comfortable life; your antiquities department is well-funded and you have staffed it with hard-working people that you trust. Today, a new donation has arrived. The crate has no return address, and when you open it, it contains only one strange artifact nestled in packing material, and no other information.
The artifact is mysterious - you feel uneasy keeping it in your office, but don’t want to store it anywhere until you figure out a bit more about it.
Strange things start to happen soon after you acquire this artifact, and you begin to have vivid disturbing dreams. You quickly realize that something is using this item to try and push its way through into your reality, and the strain is tearing at your physical and mental health.
Can you convince others that this threat is real before some otherworldly terror is loosed on the world? As your dreams and waking mind are corrupted by its influence, can you stave off madness long enough to find a way to destroy this accursed artifact?
You don’t know, but the consequences of failure are too terrible not to try.
In this world is not yours, one player plays the roles of numerous families over the span of four generations, while the other person plays the role of the house they live in. Over time, the families change and grow, while the house remains as it was, yet still changing and growing with the families as they do.